/**
 * 
 */
package com.mc.list;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections4.CollectionUtils;

/**
 * @author w.weizhen
 *
 */
public class ListMain {

	/**
	 * @param args
	 */
	public static void main(String[] args) 
	{
		Map<String, Long> map = new HashMap<String, Long>();
		String key = "xx";
		Long val = System.currentTimeMillis() - 1000;
		System.out.println(val);
		val = null;
		map.put(key, val = System.currentTimeMillis());
		System.out.println(map.get(key));
		
		
	}
	
	
}